Analog Devices Inc./Maxim Integrated MAX6329TLUT+T

Overview

MAX6329TLUT+T from Maxim Integrated is a 150mA, +3.3V fixed-output low-dropout linear regulator with integrated -5% reset threshold, open-drain active-low RESET output, and shutdown control. It features 25µA quiescent current, 180mV dropout at 100mA, ±3.0% output accuracy, and operates from 2.5V to 5.5V input-designed for battery-powered microprocessor systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6329TLUT+T datasheet, MAX6329TLUT+T pinout, MAX6329TLUT+T application, or MAX6329TLUT+T equivalent, key selection criteria include its SOT23-6 package, SHDN-controlled ultra-low shutdown current (<1µA), 100ms minimum reset timeout, reverse leakage protection, and compatibility with 1µF ceramic output capacitors in space-constrained portable designs.

Technical Context

The MAX6329TLUT+T integrates a P-channel MOSFET LDO regulator core with a precision bandgap reference (1.23V) and comparator-based reset supervisor sharing the same reference. Its feedback path auto-selects between internal resistors (SET = GND) and external dividers, enabling fixed +3.3V output with -5% reset threshold (VTH = 2.92V min).

Reset assertion occurs when VOUT falls below 2.92V and remains active for ≥100ms after recovery; SHDN provides active-low digital enable/disable with <1µA shutdown current. Thermal shutdown activates at +160°C with 20°C hysteresis, and reverse leakage protection blocks OUT-to-IN current flow during backup-battery operation.

Key Specifications

Pinout & Package

MAX6329TLUT+T is housed in a 6-pin SOT23-6 package with exposed pad thermal enhancement. Pin 2 (GND) serves dual electrical and thermal functions-requires soldering to PCB ground plane for optimal thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator with integrated reset applications.

Compared with MAX6328TLUT+T, MAX6329TLUT+T provides tighter -5% reset margin and open-drain flexibility; versus TPS76333DBVR, it delivers integrated supervision and 3.4× lower quiescent current-but requires no additional reset IC or layout changes.

Availability

MAX6329TLUT+T is available at Aetrix Electronics and suitable for hand-held instruments, USB devices, and cellular telephones requiring stable component supply across extended production lifecycles.

Supply support for MAX6329TLUT+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and connectivity in demanding environments.

The MAX6329 series belongs to Maxim's micropower supervisor + LDO family, engineered specifically for battery-operated portable electronics needing guaranteed power-up sequencing, brownout immunity, and minimal standby current.

FAQ

What is the reset timeout duration for MAX6329TLUT+T?

The MAX6329TLUT+T guarantees a minimum reset timeout period of 100ms after the regulator output rises above the -5% reset threshold (2.92V). This ensures clock oscillators and memory controllers stabilize before the microprocessor exits reset. The actual timeout may extend up to 300ms depending on process variation, but design must assume ≥100ms per the datasheet specification. MAX6329TLUT+T does not allow user adjustment of this timeout.

Can MAX6329TLUT+T operate with a 1µF ceramic output capacitor?

Yes, MAX6329TLUT+T is fully stable with a 1µF X7R or X5R ceramic capacitor on the OUT pin across its full operating temperature range (-40°C to +85°C). This eliminates need for larger tantalum or aluminum electrolytic capacitors. Using Z5U or Y5V dielectrics may require ≥2.2µF for stability below -10°C. MAX6329TLUT+T's internal compensation is optimized for this low-ESR, low-capacitance condition.

Does MAX6329TLUT+T support adjustable output voltage?

No, MAX6329TLUT+T is factory-configured for fixed +3.3V output with -5% reset threshold and open-drain RESET. Adjustable output capability requires a different suffix (e.g., MAX6329WUT+T for +1.8V or MAX6329AUT+T for adjustable mode). The "TL" in MAX6329TLUT+T explicitly denotes +3.3V/-5%/open-drain configuration per Maxim's Selector Guide.

What is the maximum input voltage for MAX6329TLUT+T?

The absolute maximum input voltage for MAX6329TLUT+T is +7V, but the recommended operating range is +2.5V to +5.5V per the Electrical Characteristics table. Exceeding +5.5V risks violating safe operating area limits even briefly. At VIN = +5.5V and IOUT = 150mA, dropout voltage reaches ~750mV (per W/V version data), so practical maximum VIN depends on required headroom for regulation.

How does the SHDN pin function on MAX6329TLUT+T?

The SHDN pin on MAX6329TLUT+T is an active-low digital control that disables the entire regulator core-including error amplifier, reference, and pass transistor-reducing total supply current to <1µA. When pulled high (≥0.8×VIN), MAX6329TLUT+T operates normally; when pulled low (≤0.3×VIN), it enters ultra-low-power shutdown. Internal SHDN leakage is ±1µA, allowing direct connection to µP GPIO without external drivers.